1 files changed, 53 insertions, 80 deletions

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 65e12bca657..0491cdf63f2 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -694,9 +694,8 @@ static ssize_t read_zero(struct file * file, char __user * buf,
 		written += chunk - unwritten;
 		if (unwritten)
 			break;
-		/* Consider changing this to just 'signal_pending()' with lots of testing */
-		if (fatal_signal_pending(current))
-			return written ? written : -EINTR;
+		if (signal_pending(current))
+			return written ? written : -ERESTARTSYS;
 		buf += chunk;
 		count -= chunk;
 		cond_resched();
@@ -823,6 +822,7 @@ static const struct file_operations zero_fops = {
  * - permits private mappings, "copies" are taken of the source of zeros
  */
 static struct backing_dev_info zero_bdi = {
+	.name		= "char/mem",
 	.capabilities	= BDI_CAP_MAP_COPY,
 };
 
@@ -864,96 +864,67 @@ static const struct file_operations kmsg_fops = {
 	.write =	kmsg_write,
 };
 
-static int memory_open(struct inode * inode, struct file * filp)
-{
-	int ret = 0;
-
-	lock_kernel();
-	switch (iminor(inode)) {
-		case 1:
-			filp->f_op = &mem_fops;
-			filp->f_mapping->backing_dev_info =
-				&directly_mappable_cdev_bdi;
-			break;
+static const struct memdev {
+	const char *name;
+	const struct file_operations *fops;
+	struct backing_dev_info *dev_info;
+} devlist[] = {
+	[ 1] = { "mem", &mem_fops, &directly_mappable_cdev_bdi },
 #ifdef CONFIG_DEVKMEM
-		case 2:
-			filp->f_op = &kmem_fops;
-			filp->f_mapping->backing_dev_info =
-				&directly_mappable_cdev_bdi;
-			break;
+	[ 2] = { "kmem", &kmem_fops, &directly_mappable_cdev_bdi },
 #endif
-		case 3:
-			filp->f_op = &null_fops;
-			break;
+	[ 3] = {"null", &null_fops, NULL },
 #ifdef CONFIG_DEVPORT
-		case 4:
-			filp->f_op = &port_fops;
-			break;
+	[ 4] = { "port", &port_fops, NULL },
 #endif
-		case 5:
-			filp->f_mapping->backing_dev_info = &zero_bdi;
-			filp->f_op = &zero_fops;
-			break;
-		case 7:
-			filp->f_op = &full_fops;
-			break;
-		case 8:
-			filp->f_op = &random_fops;
-			break;
-		case 9:
-			filp->f_op = &urandom_fops;
-			break;
-		case 11:
-			filp->f_op = &kmsg_fops;
-			break;
+	[ 5] = { "zero", &zero_fops, &zero_bdi },
+	[ 7] = { "full", &full_fops, NULL },
+	[ 8] = { "random", &random_fops, NULL },
+	[ 9] = { "urandom", &urandom_fops, NULL },
+	[11] = { "kmsg", &kmsg_fops, NULL },
 #ifdef CONFIG_CRASH_DUMP
-		case 12:
-			filp->f_op = &oldmem_fops;
-			break;
+	[12] = { "oldmem", &oldmem_fops, NULL },
 #endif
-		default:
-			unlock_kernel();
-			return -ENXIO;
-	}
-	if (filp->f_op && filp->f_op->open)
-		ret = filp->f_op->open(inode,filp);
+};
+
+static int memory_open(struct inode *inode, struct file *filp)
+{
+	int minor;
+	const struct memdev *dev;
+	int ret = -ENXIO;
+
+	lock_kernel();
+
+	minor = iminor(inode);
+	if (minor >= ARRAY_SIZE(devlist))
+		goto out;
+
+	dev = &devlist[minor];
+	if (!dev->fops)
+		goto out;
+
+	filp->f_op = dev->fops;
+	if (dev->dev_info)
+		filp->f_mapping->backing_dev_info = dev->dev_info;
+
+	if (dev->fops->open)
+		ret = dev->fops->open(inode, filp);
+	else
+		ret = 0;
+out:
 	unlock_kernel();
 	return ret;
 }
 
 static const struct file_operations memory_fops = {
-	.open		= memory_open,	/* just a selector for the real open */
-};
-
-static const struct {
-	unsigned int		minor;
-	char			*name;
-	umode_t			mode;
-	const struct file_operations	*fops;
-} devlist[] = { /* list of minor devices */
-	{1, "mem",     S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops},
-#ifdef CONFIG_DEVKMEM
-	{2, "kmem",    S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops},
-#endif
-	{3, "null",    S_IRUGO | S_IWUGO,           &null_fops},
-#ifdef CONFIG_DEVPORT
-	{4, "port",    S_IRUSR | S_IWUSR | S_IRGRP, &port_fops},
-#endif
-	{5, "zero",    S_IRUGO | S_IWUGO,           &zero_fops},
-	{7, "full",    S_IRUGO | S_IWUGO,           &full_fops},
-	{8, "random",  S_IRUGO | S_IWUSR,           &random_fops},
-	{9, "urandom", S_IRUGO | S_IWUSR,           &urandom_fops},
-	{11,"kmsg",    S_IRUGO | S_IWUSR,           &kmsg_fops},
-#ifdef CONFIG_CRASH_DUMP
-	{12,"oldmem",    S_IRUSR | S_IWUSR | S_IRGRP, &oldmem_fops},
-#endif
+	.open		= memory_open,
 };
 
 static struct class *mem_class;
 
 static int __init chr_dev_init(void)
 {
-	int i;
+	int minor;
 	int err;
 
 	err = bdi_init(&zero_bdi);
@@ -964,10 +935,12 @@ static int __init chr_dev_init(void)
 		printk("unable to get major %d for memory devs\n", MEM_MAJOR);
 
 	mem_class = class_create(THIS_MODULE, "mem");
-	for (i = 0; i < ARRAY_SIZE(devlist); i++)
-		device_create(mem_class, NULL,
-			      MKDEV(MEM_MAJOR, devlist[i].minor), NULL,
-			      devlist[i].name);
+	for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) {
+		if (!devlist[minor].name)
+			continue;
+		device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor),
+			      NULL, devlist[minor].name);
+	}
 
 	return 0;
 }